diff options
Diffstat (limited to 'sys/boot/i386/libi386/biosacpi.c')
-rw-r--r-- | sys/boot/i386/libi386/biosacpi.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/sys/boot/i386/libi386/biosacpi.c b/sys/boot/i386/libi386/biosacpi.c index bedc722..8167fca 100644 --- a/sys/boot/i386/libi386/biosacpi.c +++ b/sys/boot/i386/libi386/biosacpi.c @@ -60,25 +60,40 @@ biosacpi_detect(void) if ((rsdp = biosacpi_find_rsdp()) == NULL) return; - /* export values from the RSDP */ + /* + * Report the RSDP to the kernel. While this can be found with + * a BIOS boot, the RSDP may be elsewhere when booted from UEFI. + * The old code used the 'hints' method to communite this to + * the kernel. However, while convenient, the 'hints' method + * is fragile and does not work when static hints are compiled + * into the kernel. Instead, move to setting different tunables + * that start with acpi. The old 'hints' can be removed before + * we branch for FreeBSD 12. + */ sprintf(buf, "0x%08x", VTOP(rsdp)); setenv("hint.acpi.0.rsdp", buf, 1); + setenv("acpi.rsdp", buf, 1); revision = rsdp->Revision; if (revision == 0) revision = 1; sprintf(buf, "%d", revision); setenv("hint.acpi.0.revision", buf, 1); + setenv("acpi.revision", buf, 1); strncpy(buf, rsdp->OemId, sizeof(rsdp->OemId)); buf[sizeof(rsdp->OemId)] = '\0'; setenv("hint.acpi.0.oem", buf, 1); + setenv("acpi.oem", buf, 1); sprintf(buf, "0x%08x", rsdp->RsdtPhysicalAddress); setenv("hint.acpi.0.rsdt", buf, 1); + setenv("acpi.rsdt", buf, 1); if (revision >= 2) { /* XXX extended checksum? */ sprintf(buf, "0x%016llx", rsdp->XsdtPhysicalAddress); setenv("hint.acpi.0.xsdt", buf, 1); + setenv("acpi.xsdt", buf, 1); sprintf(buf, "%d", rsdp->Length); setenv("hint.acpi.0.xsdt_length", buf, 1); + setenv("acpi.xsdt_length", buf, 1); } } |